<template>
  <view>
    <!-- 搜索模块 -->
    <ugo-search></ugo-search>
    <!-- 主体区域 -->
    <view class="m-category">
      <scroll-view scroll-y class="left">
        <view
          @click="changeActiveIndex(index)"
          class="item"
          :class="{ active: index === activeIndex }"
          v-for="(item, index) in cateLeft"
          :key="item.cat_id"
          >{{ item.cat_name }}</view
        >
      </scroll-view>
      <scroll-view :scroll-top="scrollTop" scroll-y class="right">
        <view class="cate" v-for="item in cateRight" :key="item.cat_id">
          <view class="title">{{ item.cat_name }}</view>
          <view class="goods-list">
            <navigator
              class="goods"
              v-for="goods in item.children"
              :key="goods.cat_id"
              :url="`/pages/goods_list/index?query=${goods.cat_name}&cid=${goods.cat_id}`"
            >
              <image :src="goods.cat_icon" class="pic" mode="aspectFit" />
              <view class="name">{{ goods.cat_name }}</view>
            </navigator>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      activeIndex: 0,
      cateList: [],
      scrollTop: -1,
    };
  },
  computed: {
    cateLeft() {
      return this.cateList.map((item) => {
        return {
          cat_id: item.cat_id,
          cat_name: item.cat_name,
        };
      });
    },
    cateRight() {
      return this.cateList.length
        ? this.cateList[this.activeIndex].children
        : [];
    },
  },
  onLoad() {
    this.getCateList();
  },
  methods: {
    changeActiveIndex(index) {
      this.activeIndex = index;
      // this.scrollTop = 0;
      this.scrollTop = this.scrollTop ? 0 : -1;
      // this.scrollTop = -1;
      // this.$nextTick(()=> {
      //   this.scrollTop = 0;
      // });
    },
    async getCateList() {
      const res = await uni.$u.http.get("/categories");
      // console.log(res);
      this.cateList = res.data.message;
    },
  },
};
</script>

<style lang="scss">
.m-category {
  display: flex;
  height: calc(100vh - 20rpx - 34px);
  .left {
    height: 100%;
    width: 182rpx;
    font-size: 28rpx;
    text-align: center;
    background-color: #f3f3f3;
    .item {
      padding: 17rpx 0;
      &.active {
        background: #fff;
        color: #ea4350;
        position: relative;
        &::before {
          content: "";
          position: absolute;
          left: 0;
          width: 4rpx;
          height: 44rpx;
          background: #ea4350;
        }
      }
    }
  }
  .right {
    height: 100%;
    flex: 1;
    .title {
      margin: 18rpx 0 21rpx;
      text-align: center;
    }
  }
}
.goods-list {
  display: flex;
  padding: 0 48rpx;
  justify-content: space-between;
  flex-wrap: wrap;
  .pic {
    width: 120rpx;
    height: 120rpx;
  }
  .name {
    margin-bottom: 30rpx;
    font-size: 21rpx;
    color: #2e2e2e;
    text-align: center;
    line-height: 1;
  }
}
</style>

